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A horse and a saddle cost $5000. If the horse cost 4 times as much as the saddle, what was the cost of each?
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If the saddle costs x dollars, then the horse costs 4x dollars.
Together, they cost x + 4x = 5x dollars, and it is $5000, according to the condition, so
5x = 5000 is your equation, which implies x = 1000 dollars.
Answer. The saddle costs $1000; the horse costs $4000.